During the high-temperature, high-pressure lamination process of multilayer PCBs and FPCs, melted resin bleed is inevitable. However, if this semi-liquid resin adheres to the steel press plates, it causes severe equipment damage and production downtime. PTFE Coated Fiberglass Fabric (PTFE Tape) acts as a pure release and isolation consumable. Leveraging its ultra-low surface energy and high-toughness mesh structure, it is the ultimate defense against resin adhesion.
Physical & Thermodynamic Principles: Surface Energy and Reinforcement The performance of PTFE release fabric relies on both surface chemistry and physical structure:
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Thermodynamic Release Mechanism: The tight Carbon-Fluorine (C-F) bonds in PTFE result in extremely low solid surface energy (γ_s ≈ 18 mN/m). According to the Work of Adhesion formula: Wa = γ_s + γ_l – γ_sl (Work of Adhesion = Solid Surface Energy + Liquid Resin Energy – Interfacial Energy) Because PTFE’s γ_s is exceptionally low, Wa approaches zero. Even under high heat and pressure, melted epoxy cannot wet the fabric, causing it to bead up and enabling effortless, zero-residue peeling.
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Tear Strength Reinforcement: Pure PTFE is prone to cold flow under pressure. Lixing coats PTFE uniformly onto a high-strength fiberglass mesh, drastically improving dimensional stability. The Tear Strength formula is: Ts = F / d (Tear Strength = Maximum Force / Thickness) The reinforced PTFE tape typically achieves a Ts > 40 kN/m, flawlessly resisting the mechanical pulling forces during automated mold opening.
Industrial Applications: Vacuum Lamination and PCB Manufacturing Lixing Composite Material provides precise PTFE release solutions:
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FPC Vacuum Lamination: Positioned between the buffer pad and the PCB stack, it completely blocks resin bleed while its smooth surface ensures a flawless, indentation-free substrate post-lamination.
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Equipment Protection: Extreme toughness ensures the release fabric neither ruptures nor powders after repeated thermal cycles, fully protecting the press head from resin contamination.
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